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Yes some of the introductions we have done around the world are devastating. Many are early efforts at biological control ie rabbits to Australia and the cane toad wow. In Alberta we are using grass carp and silver carp for weed and algae control but they are triploid and not able to reproduce so they don't take over. The silver carp eats suspended algae sort of a filter feeder. I am sure they are used in other countries too but we are having a go at them here.
Scots pine can have yellowish and bluish tinges to them. I have a cultivar that gets a yellowish tinge in winter it is very hardy and doesn't sun scald.
We get a lot of sunscald here in winter when the days get longer and the sun reflects off the snow and the tissue gets dried out.
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